This patch adds the possibility to call a board specific
i2c bus reset routine for the fsl_i2c bus driver, and adds
this option for the keymile kmeter1 board.
The deblock sequence for this board is implemented and
tested in the following way:
CR = 0x20 (release SDA and SCL pin)
CR = 0xa0 (start read)
dummy read
dummy read
if 2. dummy read == 0x00
3. dummy read
CR = 0x80 (SDA and SCL now 1 SR = 0x86)
CR = 0x00 (Modul reset SR=0x81)
CR = 0x80 (SDA and SCL = 1, SR = 0x81)
Signed-off-by: Heiko Schocher
---
board/keymile/common/common.c | 20
drivers/i2c/fsl_i2c.c |6 ++
include/configs/kmeter1.h |1 -
3 files changed, 26 insertions(+), 1 deletions(-)
diff --git a/board/keymile/common/common.c b/board/keymile/common/common.c
index 2594623..ec27bda 100644
--- a/board/keymile/common/common.c
+++ b/board/keymile/common/common.c
@@ -424,6 +424,7 @@ static int get_scl (void)
#endif
+#if !defined(CONFIG_KMETER1)
static void writeStartSeq (void)
{
set_sda (1);
@@ -474,6 +475,7 @@ static int i2c_make_abort (void)
get_sda ();
return ret;
}
+#endif
/**
* i2c_init_board - reset i2c bus. When the board is powercycled during a
@@ -481,6 +483,23 @@ static int i2c_make_abort (void)
*/
void i2c_init_board(void)
{
+#if defined(CONFIG_KMETER1)
+ struct fsl_i2c *dev;
+ dev = (struct fsl_i2c *) (CONFIG_SYS_IMMR + CONFIG_SYS_I2C_OFFSET);
+ uchar dummy;
+
+ out_8 (&dev->cr, (I2C_CR_MSTA));
+ out_8 (&dev->cr, (I2C_CR_MEN | I2C_CR_MSTA));
+ dummy = in_8(&dev->dr);
+ dummy = in_8(&dev->dr);
+ if (dummy != 0xff) {
+ dummy = in_8(&dev->dr);
+ }
+ out_8 (&dev->cr, (I2C_CR_MEN));
+ out_8 (&dev->cr, 0x00);
+ out_8 (&dev->cr, (I2C_CR_MEN));
+
+#else
#if defined(CONFIG_HARD_I2C)
volatile immap_t *immap = (immap_t *)CONFIG_SYS_IMMR ;
volatile i2c8260_t *i2c = (i2c8260_t *)&immap->im_i2c;
@@ -500,6 +519,7 @@ void i2c_init_board(void)
/* Set the PortPins back to use for I2C */
setports (0);
#endif
+#endif
}
#endif
#endif
diff --git a/drivers/i2c/fsl_i2c.c b/drivers/i2c/fsl_i2c.c
index 6ab7d3d..ce0f301 100644
--- a/drivers/i2c/fsl_i2c.c
+++ b/drivers/i2c/fsl_i2c.c
@@ -178,6 +178,12 @@ i2c_init(int speed, int slaveadd)
struct fsl_i2c *dev;
unsigned int temp;
+#ifdef CONFIG_SYS_I2C_INIT_BOARD
+ /* call board specific i2c bus reset routine before accessing the */
+ /* environment, which might be in a chip on that bus. For details */
+ /* about this problem see doc/I2C_Edge_Conditions. */
+ i2c_init_board();
+#endif
dev = (struct fsl_i2c *) (CONFIG_SYS_IMMR + CONFIG_SYS_I2C_OFFSET);
writeb(0, &dev->cr);/* stop I2C controller */
diff --git a/include/configs/kmeter1.h b/include/configs/kmeter1.h
index 1735683..811ba88 100644
--- a/include/configs/kmeter1.h
+++ b/include/configs/kmeter1.h
@@ -33,7 +33,6 @@
/* include common defines/options for all Keymile boards */
#include "keymile-common.h"
-#undef CONFIG_SYS_I2C_INIT_BOARD
#define CONFIG_MISC_INIT_R 1
/*
* System Clock Setup
--
1.6.0.6
--
DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
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